Souterrean or Souterrain: How To spell?

The word Souterrean is misspelled against Souterrain, a noun meaning "A grotto or cavern under ground."

Word contains consecutive vowels 'AI' in between alphabets souterr & n is misspelled as 'EA'
Wrong Spelling:  souterr-ea-n 
Correct Spelling:  souterr-ai-n 
Check more misspelled words of Souterrain to spell it correct.

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